I recently repaired a damaged burner No 4047 from a Primus 110. I got to see its interesting design. After unscrewing the nozzle, I didn’t notice any holes beneath the thread of the nozzle socket. As it turned out later, they were clogged with soot. To cut off the deformed part, I had to measure the depth of the “hollow tube.” I managed not to damage the perforated section beneath the nozzle socket. Now I had a complete picture of this interesting design. Thanks to this repair,and the diagram from this manual 4283 (very similar design) posted by Staffan Rönn https://classiccampstoves.com/threa...ing-instructions-from-1937-and-onwards.39635/ I was able to understand where the coke builds up and how to clean it. I managed to put everything together. I described the soldering process in this thread: A DIY Trick to Make 360-Degree Soldering Easier I made a similar skewer to unclog the holes. By the way, I have a question. Are these channels meant to help create the right conditions for good vaporization, or do they serve a different purpose? ...or perhaps they are used to trap impurities from the vaporized fuel before it reaches the nozzle?
